Leaf narrowly linear, 60–120 × 0.8–1.5 mm, sparsely hairy or glabrous. Flower stem 80–160 mm tall, hairy, 1-flowered. Flowers 10–12 × 12–18 mm, sepals and petals sometimes irregularly arranged, internally white, externally greenish brown with tiny purple glands; labellum white with faint purplish bars, apex reddish purple, calli purple; column pale green. Dorsal sepal 8–10 × 2.5–3 mm. Lateral sepals falcate, 8–10 × 2–2.5 mm, widely divergent. Petals spreading or upcurved, 7–10 × 1–1.5 mm, sometimes kinked near apex. Labellum 5–6 × 3.5–4 mm; lateral lobes entire; midlobe recurved, with 6–8 pairs of purple teeth. Calli crowded, in 2 irregular rows extending halfway along midlobe. Column 5–5.5 × 1.8 mm, broadly winged.